Image intensifier tube with optimized electrical insulation
AssigneeThomson Tubes Electroniques
InventorsYves Beauvais, Pierre Joly, Jean-Marie Deon, Maurice Verat
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Abstract
An apparatus for electrically insulating viewing windows in an image intensifier tube is disclosed. The mechanical parts which are located close to the window are electrically insulated with the metal parts being held at a high voltage and electrically insulated on the outside of the image intensifier by an insulating screen. The insulating screen includes electrically conductive layer 36 and an insulating layer 37 which separates the metal parts 20, 26 from the conductive layer. The conductive layer also forms an equipotential layer which is opposite the metal parts and thereby "freezes" the distribution of the electrical lines of force in the insulating screen 35.
Claims9
An image intensifier tube being surrounded by an envelope and being supplied with a high voltage, said tube comprising:
- a viewing window supported by metal parts wherein said metal parts have a potential approximately equal to the potential of said intensifier tube high voltage supply potentials;
- an insulating screen for electrically insulating said metal parts on the outside of said image intensifier tube, said insulating screen including an electrically conductive layer and an electrically insulating layer with said electrically insulating layer separating said electrically conductive layer from said metal parts.
Dependencies are inferred from the claim text.